[nsnhd]

I don't know diddly about any of this. I'm just a user trying. When I learn, I will teach others. You seem very on top of the game. Why don't you teach us? You write the Nvdia API or Windows10 Creators Update API is a one time config setting as if everything HDR and non-hdr is automated, adjusted, set and forget. Maybe it is? Remember, I'm an idiot and I respect your knowledge. Maybe you could share exactly how you've accomplished what appears to be impossible at this time. Perhaps I'm dumber than I think and completely missed the boat you're on. I'd like to sail too. Help me.

madVR must be used in fullscreen exclusive mode. (find the setting in madVR configuration) You can use unoffical Kodi DS with madVR and be done with it. GTX1030 is a highly recommended GPU for this.

But GT 1030 has only 2GB Vram and I remember @madshi and @nevcairiel have warned to stay away from 2GB cards because the vram lack to render 4K.